Tire balls are sized for a tire's open space. There are different sized balls for a standard front and rear tire. If the trials tire has a different open space than a standard tire it could be a problem. Dunno, just what I'd be worried about. You might try asking TireBalls about it.
As for your friend's experience with TireBalls/Broc that sounds about right, they stand behind their product. Awesome guys and very busy. Any idea of why the balls went bad? Did he put too many/too few balls in? What tire ball pressures was he running? What kind of race and speeds was he doing? The only time I've heard of issues with high speeds, heavy bikes and pavement for extended periods of time.
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